All the callers need to pass it in: currently channeld and openingd just
fake it by copying the payment point.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
jl777 reported a crash when we try to pay past reserve. Fix that (and
a whole class of related bugs) and add tests.
In test_lightning.py I had to make non-async path for sendpay() non-threaded
to get the exception passed through for testing.
Closes: #236
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Rusty Russell